Simple Swift class does not compile - swift

Question

My simple class, ClassWithOneArray, produces this error:
Bitcast requires both operands to be pointer or neither %19 =
bitcast i64 %18 to %objc_object*, !dbg !470 LLVM ERROR: Broken
function found, compilation aborted! Command
/Applications/Xcode6-Beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift
failed with exit code 1
However, my class, ClassWithOneInt, does not. Why?
class ClassWithOneInt {
var myInt = Int()
init(myInt: Int) {
self.myInt = Int()
}
func encodeWithCoder(aCoder: NSCoder) {
aCoder.encodeObject(myInt, forKey: "myInt")
}
init(coder aDecoder: NSCoder) {
self.myInt = aDecoder.decodeObjectForKey("myInt") as Int
}
}
class ClassWithOneArray {
var myArray = String[]()
init(myArray: String[]) {
self.myArray = String[]()
}
func encodeWithCoder(aCoder: NSCoder) {
aCoder.encodeObject(myArray, forKey: "myArray")
}
init(coder aDecoder: NSCoder) {
self.myArray = aDecoder.decodeObjectForKey("myArray") as String[]
}
}

Answer 1

As I point out in comments, your example seems to compile fine on beta 2, although it still won't work for a couple of reasons, for encoderWithCoder to be of any use, ClassWithOneArray needs to:
declare conformance with NSCoding,
implement NSCoding,
inherit from NSObject or implement NSObjectProtocol, and,
use a non-mangled name.
All told, that means:
#objc(ClassWithOneArray)
class ClassWithOneArray:NSObject, NSCoding {
var myArray: String[]
init(myArray: String[]) {
self.myArray = myArray
}
func encodeWithCoder(aCoder: NSCoder) {
aCoder.encodeObject(myArray, forKey: "myArray")
}
init(coder aDecoder: NSCoder) {
self.myArray = aDecoder.decodeObjectForKey("myArray") as String[]
}
}
Also it seems as if the simple methods of testing archiving aren't available in the playground, probably because the classes don't get properly registered.
let foo = ClassWithOneArray(myArray:["A"])
let data = NSKeyedArchiver.archivedDataWithRootObject(foo)
let unarchiver = NSKeyedUnarchiver(forReadingWithData:data)
unarchiver.setClass(ClassWithOneArray.self, forClassName: "ClassWithOneArray")
let bar = unarchiver.decodeObjectForKey("root") as ClassWithOneArray

Answer 2

It looks like your syntax is a bit off for what you're trying to accomplish - something like this should work:
class ClassWithOneInt {
var myInt: Int
init(myInt: Int) {
self.myInt = myInt
}
func encodeWithCoder(aCoder: NSCoder) {
aCoder.encodeObject(myInt, forKey: "myInt")
}
init(coder aDecoder: NSCoder) {
self.myInt = aDecoder.decodeObjectForKey("myInt") as Int
}
}
class ClassWithOneArray {
var myArray: String[]
init(myArray: String[]) {
self.myArray = myArray
}
func encodeWithCoder(aCoder: NSCoder) {
aCoder.encodeObject(myArray, forKey: "myArray")
}
init(coder aDecoder: NSCoder) {
self.myArray = aDecoder.decodeObjectForKey("myArray") as String[]
}
}

Answer 3

In my experience simply declaring the Protocol "NSCoding" to your class should do the trick. Hope this helps someone.